Sigmoid : সিগমা;
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Appropriate Prepositions
Aware of(অবগত): I am not aware of his dishonesty.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Easy of (সরল): The teacher is easy of approach.
Inquire of, about, into, after (অনুসন্ধান করা): Roma inquired of me about my father’s health. The pope will inquire into the cause of fire. Mehjabin inquired after her friends.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
In vogue (চালু): This custom is not in vogue at present.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.